1. Epidemiology of Diabetes mellitus
Prof. Ashry Gad Mohamed
Dr. AmnaRehana Sediqqi
Prof. of Epidemiology
KSU

2. Objectives 1. To list the types of Diabetes Mellitus
2. To describe the prevalence of Diabetes Mellitus
3. To recognize the importance of diagnostic criteria for estimating the prevalence of diabetes mellitus
4. To discuss the risk factors and complications of type II diabetes mellitus

3. Diabetes Mellitus
Definition
A metabolic disorder of multiple aetiology characterized by chronic hyperglycaemia with disturbances of carbohydrate, fat and protein metabolism resulting from defects in insulin secretion, insulin action or both

4. Types of diabetes
Type 1 (5-10%) sudden onset absolute deficiency in insulin. Usually affects younger age group (not always)
Type 2 ( %) gradual onset of relative insulin insensitivity. Usually older age group (not always)
Gestational diabetes: Gestational diabetes mellitus (GDM) is defined as any degree of glucose intolerance with onset or first recognition during pregnancy
Secondary diabetes: The diabetes is not the main illness, a secondary condition that results because of the main illness. If it is possible to treat the main illness successfully the diabetes may/will disappear e.g. cystic fibrosis, chronic pancreatitis, infections.
Pre-diabetes: Impaired glucose tolerance A person with pre-diabetes has a blood sugar level higher than normal, but not high enough for a diagnosis of diabetes; & is at higher risk for developing type 2 diabetes. May remain undiagnosed for years; risk of complications same as for T2DM

5. Diagnosis of diabetes Symptoms Thirst Passing lots of urine Malaise
Infections (thrush)
Weight loss
BUT – many years of pre-diabetes (type 2) before these symptoms appear!
Biochemical tests
Random plasma glucose
Fasting plasma glucose
Oral glucose tolerance test – 2h glucose

6. Fasting Blood sugar Non diabetic: FBS< 110 mg/dl (6.1m mol/dl).
Glucose Intolerance: FBS mg/dl ( m mol/dl). (Increased risk of DM)
Diabetic: FBS >126 mg/dl (>7 m mol/dl)
OR Random BS >200 mg/dl (>11.1m mol/dl) .
4/21/2017
DIABETES CARE, VOLUME 36, SUPPLEMENT 1, JANUARY 2013
Prof. Ashry Gad

7. Diagnosis based on: Glucose Tolerance Test 2 hr post 75 gm glucose
If < 7.8 mmol/L = normal GTT
If ≥ 7.8 mmol/L and < 11.1 mmol/L = Impaired GTT
If ≥ 11.1 mmol/L = provisional diagnosis of Diabetes
DIABETES CARE, VOLUME 36, SUPPLEMENT 1, JANUARY 2013

8. Why is diabetes so important?
The burden to patients, carers, NHS
Complications
Cardiovascular
Eyes
Renal - Hypertension, renal failure
Feet
Skin, infections, sexual, psycho-sexual, depression
Quality of life
Premature mortality
Cost

9. Epidemiology of diabetes
Prevalence worldwide is increasing
2.8% in 2000;
4.4% in 2030 worldwide.
171 million in 2000; 366 million in 2030
Greatest rise in developing world
Prevalence estimates only include reported and diagnosed persons
There is a large % that is undiagnosed as well as a large % at high risk of developing DM

10. Diagnosed and Undiagnosed Prevalence of Diabetes by Age in the US (NHANES III)
Harris et al., Diabetes Care, 1998
4/21/2017
Prof. Ashry Gad

11. Diabetes in the world
Millions
4/21/2017
Prof. Ashry Gad

15. Estimated Number of People with Diabetes Worldwide, 2010 and 2030
Country/Territory
2010
Millions
2030 1
India
50.8
87.0 2
China
43.2
62.6 3
USA
26.8
36.0 4
Russian Federation
9.6
Pakistan
13.8 5
Brazil
7.6
12.7 6
Germany
7.5
Indonesia
12.0 7
7.1
Mexico
11.9 8
Japan
Bangladesh
10.4 9
7.0
10.3 10
6.8
Egypt
8.6
In 2009, the International Diabetes Federation estimated the number of people with diabetes ages years in 2010 and 2030 by top 10 country (or territory)
India, China, and the United States had the greatest number of people with diabetes in 2010, and these countries are expected not only to maintain this ranking but see their population of those with diabetes increase by more than 65 million
IDF Diabetes Atlas, 4th ed. ©International Diabetes Federation, 2009.
Reference
International Diabetes Foundation. IDF Diabetes Atlas, 4th ed Available at:

16. an Epidemic Disease in the
Diabetes Mellitus: Comparative Prevalence 2010
Bahrain
15.4
Kuwait
14.6
Diabetes Mellitus
an Epidemic Disease in the
Gulf Countries
UAE
18.7
Qatar
15.4
Epidemiological
Data
Saudi Arabia
16.8
Oman
13.4
2012 update from IDF shows higher comparative prevalence; full report due
Comparative prevalence: WHO standard; adjusted for age to compare with other countries
International Diabetes Federation: Fourth edition

17. an Epidemic Disease in the
Impaired Glucose Tolerance Prevalence 2010
Kuwait
18.8
Bahrain
18.8
Diabetes Mellitus
an Epidemic Disease in the
Gulf Countries
UAE
18.8
Qatar
18.8
Epidemiological
Data
Saudi Arabia
12.5
Oman
10.9
International Diabetes Federation: Fourth edition

18. Diabetes mellitus & age distribution in KSA
4/21/2017
Prof. Ashry Gad

19. Types of DM and age in KSA%
Age groups
4/21/2017
Prof. Ashry Gad

20. Figure 1: Prevalence of T2DM in urban and rural areas in the Arabic-speaking countries according to IDF estimates
Badran M & Laher I. International Journal of Endocrinology, Volume 2012 (2012),

21. Stepwise Approach to Non Communicable Diseases
WHO data from some EM countries
Country
Year of field work
Diabetes %
Hypertension %
Overweight & Obesity %
Iraq
2006
10.4
40.4
66.9
Jordan
2007 16
25.5
67.4
Saudi Arabia
2005
17.9 26
Syrian Arab Republic
2003
19.8
28.8
56.3
Kuwait
16.7
24.6
81.2
Egypt
16.5
33.4
76.4
Sudan
19.2
23.6
53.9

22. Stepwise Approach to Non Communicable Diseases
WHO data from some EM countries
Country
Year of field work
Hyper-cholestrolemia %
Smoking %
Low physical activity %
Low intake
fresh fruit vegetables %
Iraq
2006
37.5
21.6
56.7
92.3
Jordan
2007
26.2 29
5.2
14.2
Saudi Arabia
2005
19.3
12.9
33.8
91.6
Syrian Arab Republic
2003
33.5
24.7
32.9
95.7
Kuwait 42
15.7
91.5 89
Egypt
24.2
21.8
50.4 79
Sudan
19.8 12
86.8
1.7/day

23. Diabetic complications

24. Diabetic complications
Diabetes accounts for more than 5% of the global deaths, which are mostly due to CVD.
Diabetes is responsible for over one third of end-stage renal disease requiring dialysis.
Amputations are at least 10 times more common in people with diabetes.
A leading cause of blindness & visual impairment. Diabetics are 20 times more likely to develop blindness than non-diabetics.
Diabetic complications

25. Diabetes Complications in the Gulf Countries
Prevalence of microvascular complications:
Comparing data from Arab
countries with data of the
highest & lowest prevalence
world wide in the year 2000.
The major complications will
be soon the highest in Arab
countries due to the lack of
prevention programs.
WHO report 2000.
Retinopathy
Neuropathy
Nephropathy

26. Chronic complication of diabetes in North Africa 1995-2012
RETINOPATHY
Chronic complication of diabetes in North Africa
Author (year)
Location
Sample
Setting
Type of Diabetes
Prevalence %
Macky 2011
Egypt
1325
Clinic
Mixed
20.5
Kadiki 1999
960
Type 2
30.5
Elbagir 1995
Sudan 91 43
Harzallah 2006
Tunisia
370
Inpatient
/clinic
8.1
Prevalence & Complications of Diabetes Mellitus in Northern Africa: A systematic review
Bos & Agwemang BMC public Health 2013 , 13: 387

27. ALBUMINURIA AND NEPHROPATHY
Chronic complication of diabetes in North Africa
Author (year)
Location
Sample
Setting
Type of Diabetes
Prevalence
ALBUMINURIA
Herman 1998
Egypt
1451
clinic
Mixed
21.0
Elbagir 1995
Sudan
128
Proteinuria: 22
NEPHROPATHY
6.7
Kadiki
1999
Libya
960
clinics
Type 2
25.2
Harzallah 2006
Tunisia
370
inpatient &CliniC
13.1
Prevalence & Complications of Diabetes Mellitus in Northern Africa: A systematic review
Bos & Agwemang BMC public Health 2013 , 13: 387

28. Chronic complication of diabetes in North Africa 1995-2012
NEUROPATHY
Chronic complication of diabetes in North Africa
Author (year)
Location
Sample
Setting
Type of Diabetes
Prevalence %
Herman 1998
Egypt
1451
Clinic
Mixed
21.9
Kadiki
1999
Libya
960
Outpatient
Type 2
45. 7
Elmagir.
1998
Sudan
128
36.7
Harzallah 2006
Tunisia
370
Inpatient/ clinic
24.3
Prevalence & Complications of Diabetes Mellitus in Northern Africa: A systematic review
Bos & Agwemang BMC public Health 2013 , 13: 387

29. Diabetes Complications%
NIDDM
NEUROPATHY WITH DURATION
IDDM
Years
Diabetes Care 1,

30. Diabetes Complications%
BLINDNESS BY DURATION OF DIABETES
Age at diagnosis 60 years old
Age at diagnosis 20 years old
Years
ADA 1993 Vital Statistic

31. Diabetes Complications
Retinopathy:
Number of persons with
diabetic retinopathy in different countries and according to the time.
WHO report 2000
Retinopathy

32. 31.5% Diabetes Complications  Duration > 10 years.
Risk factors for Retinopathy in
Saudi diabetic patients
 Duration > 10 years.
 Presence of nephropathy.
 Older than 60 years.
 Poor diabetes control.
 Use of insulin.
Prevalence of Retinopathy in
Saudi diabetic patients
31.5%
IDDM 42.5%
NIDDM 25.3%

33. Risk factors
Risk factors for Type 2 DM are complex including obesity, genetic and life style factors (overfeeding and sedentary life). There is patho- physiological changes (weight gain insulin resistance and reduction of insulin secretion) may lead to glucose intolerance and diabetes.
Important factors are physical inactivity, dietary imbalance and infections
4/21/2017

34. Obesity Contributes to the resistance to endogenous insulin. 22-23 3.0
RR risk of DM in females (ref. BMI < 22)
>
(Colditz & al, Ann Int Med, 1995, 122; 481-6)
4/21/2017

35. Risk factors: Contd
Genetic factors may play a part in development of all types; autoimmune disease and viral infections may be risk factors in Type I DM.
Physiologic or emotional stress: causes prolonged elevation of stress hormone levels (cortisol, epinephrine, glucagon and growth hormone), which raises blood glucose levels, placing increased demands on the pancreas.

36. Predisposing factors
Pregnancy: causes weight gain and increases levels of estrogen and placental hormones, which antagonize insulin
Medications that are known to antagonize the effects of insulin: thiazide diuretics, adrenal corticosteroids, oral contraceptives.
4/21/2017

37. Prevalence of DM in 60 years old Men
Decoda:Nakagami; Diabetologia 2003

38. Prevalence of DM in 60 years old Women
Decoda:Nakagami; Diabetologia 2003

39. Future Directions Tackling environmental factors and lifestyle
Appropriate use of screening tools to control diabetes mellitus
Early interventions in high risk populations
Therapeutic and management choices and updated criteria for treatment
Rehabilitation services for complications

40. References http://www.diabetesatlas.org/content/global-burden.
Al-Madani A. Diabetes Complications in the Gulf Countries. Presentation.
Ibtihal Fadhil. RA/ NCD/ Health promotion and Protection /EMRO/WHO Diabetes and Other Non-Communicable Diseases / EM Regional Perspective. First BA Regional Workshop on the Epidemiology of Diabetes and Other Non-Communicable Diseases , Bibliotheca Alexandrina January 2009.
WILD S, ROGLIC G, GREEN A, SICREE R, KING R. Global Prevalence of Diabetes. Estimates for the year 2000 and projections for DIABETES CARE 2004; 27 (5):

41. Thank You